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Quadratus lumborum action
unilaterally: laterally tilt the pelvis, laterally flex the vertebral column to the same side, assist to extend the vertebral column. Bilaterally: fix the last rib during inhalation and forced exhalation
Quadratus lumborum insertion
last rib and transverse processes of first through fourth lumbar vertebrae
Gluteus maximus action
all fibers: extend the hip, laterally rotate the hip, abduct the hip. Lower fibers: adduct the hip
Gluteus maximus origin
coccyx, edge of sacrum, posterior illiac crest, sacrotuberous and sacroilliac ligaments
Gluteus medius action
all fibers: abduct the hip. Anterior fibers: flex the hip, medially rotate the hip. Posterior fibers: extend the hip, laterally rotate the hip.
Gluteus medius origin
gluteal surface of the ilium between the iliac crest and the posterior and anterior gluteal lines
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